Graduate Thesis Or Dissertation
 

The Conduction Properties of Heavily Acceptor Doped Lead Zirconate Titanate Ceramics

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9c67wv875

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  • Heavily acceptor doped Pb1.02Dx(Zr0.5Ti0.5)1-xO3 ceramics, where A is the dopant, were investigated in this research. Dopants studied included iron, magnesium and manganese at mole concentrations x ≤ 0.20. X-ray diffraction data along with scanning electron microscopy images revealed the solubility limits of these ceramics. All doped compositions exhibited a shift from tetragonal geometry to potentially rhombohedral geometry with increasing dopant concentrations. Dielectric measurements showed a decrease in the permittivity with increasing dopant concentration up to the solubility limit, after which minimal change was observed. This indicated that the secondary phases formed in all three doped compositions did not have a significant impact on the permittivity. The conductivity data collected under AC and DC conditions confirmed Arrhenius behavior in all samples with the activation energy values showing no trend in its dependence on dopant concentrations. A significant increase in the conductivity was observed for samples containing dopants beyond the solubility limit. This was attributed to the accumulation of secondary phases in grain boundaries aiding the formation of a shortened conduction path in the ceramic. Conductivity data collected using three methods confirmed that the data obtained represented the true conductivity of sample and was not dependent on the experimental environment. Transport number measurements revealed that the conduction in iron doped PZT ceramics was likely dominated by electronic mechanisms, implying further research is needed to develop an ionic conductor based on PZT.
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  • Pending Publication
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  • 2022-06-10 to 2023-07-11

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